Serving tray



FIG. 1 is a top plan view of a serving tray showing our new design;

FIG. 2 is a left side elevational view, the right side elevational view being a mirror image thereof;

FIG. 3 is a front elevational view, the rear elevational view being a mirror image thereof; and,

FIG. 4 is a bottom view thereof. 

The ornamental design for a serving tray, as shown and described. 